Megaphone



June 9, 1925.

C. H. DODGE ET AL MEGAPHONE Filed Aug. 21. 1922 Patented June 9, 1925.

UNITED. STATES PATENT OFFICE.

CHARLES H. DODGE AND ROBERT H. E. SCHLECHT, OF ST. LOUIS, MISSOURI.

MEGAPHONE.

Application filed August 21, 1922; Serial No. 583,257.

To all whom it may concern:

Be it known that we, CHARLES H. Doncn and ROBERT H. E. SoHLnonr, citizens of the United States, and residents of the city of St. Louis and State of Missouri, have invented certain new and useful Improvements in Megaphones, of which the following is a specification, containing a full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

Our invention relates to certain new and useful improvements in megaphones, and has for its primary object the construction of a megaphone formed of a series of telescoping sections, the adjacent ends of the sections being so constructed that when the megaphone is extended for use, the adjacent ends will be held firmly and tightly together.

In the drawings:

Fig. 1 is a side View of our extended for use.

Fig. 2 is a bottom plan view of our improvement when collapsed and not in use.

Fig. 3 is a fragmental section of the mouthpiece, and Fig. 4 is an enlarged fragmental section showing the construction by means of which the sections are connected together.

Referring to the drawings, 5, 6, 7, 8, 9 and 1.0, indicate a series of sections out of which our megaphone is constructed. Secured to the small end of section 5 is a mouthpiece, 11. The mouthpiece 11 is provided with a bead or rib 12 against which the end of invention section 5 is placed, and by means of tacks 13, the mouthpiece is held in position. The section 10 is provided with ahead 14; secured to the section 10 are crossed wires 15, which keep the sections 5, 6, 7, 8, and 9 from falling through section 10 when the megaphone is collapsed.

It will be noted that the sections are not tapered uniformly from end to end, but aportion at the upper and lower ends, 16 and 17 has different taper from the intermedi ate portion of the section. The portion 16 of section 8, for instance, and the portion 17 of said section are, only slightly tapered and almost parallel to the axis of said sec tion, whereas the intermediate portion of said section is tapered at quite an angle to said axis so that one end of each section is considerably larger than its opposite end. By this construction of the ends of the sec tions a tighter and firmer joint may be effected between the adjacent ends of the sections than when the sections are uniformly tapered.

As previously pointed out, the marginal portions of the ends of each section have a lesser taper than the portion of the section between the marginal portions of the ends, this being clearly shown in Figs. 1 and 4.

It will further be observed that the portions 16 and 17 of each section have the same taper, that is to say, they are arranged at substantially the same angle to the axis of the sections.

It is obvious that the portion of the sections between the end portions may be formed in various shapes, if desired, and our improvement may be applied to various sound amplifiers, such as phonograph horns, etc.

Having fully described our invention, what we claim, is:

A megaphone comprising a tapered rear section and a tapered forward section, the former being provided with a mouthpiece, a plurality of intermediate tapered sections, the terminal portion of the forward end of the rear sectionand of each intermediate section being bent inwardly and out of alinement with the exterior surface of said section, the terminal portion of the rear end of the forward section and of each of said intermediate sections being bent outwardly from the intermediate surface of said section, the outward and inward bent portions being parallel to each other, whereby the oppositely bent portions of adjacent sections will fit snugly one within the other and be held in close frictional contact thereby preventing casy collapse of said megaphone without the use of any extraneous fastening means, and means extending across the free end of "the forward section for preventing the remaining sections from passing therethrough when the megaphone is collapsed.

In testimony whereof, we have signed our names to this specification.

CHARLES H. DODGE.

ROBERT H. E. SCHLECHT. 

